How Honeycomb apps scale

Here is my app in Honeycomb without changing a line of code, notice that honeycomb creates that grid menu button at the bottom. Hitting this does the same thing as hitting menu on the phone:

Here is my app in Honeycomb after adding one line of code. This one line of code tells it to switch to "Honeycomb mode" when running on Honeycomb. Notice the menu button is gone and instead the contents of the menu button now reside in the action bar overflow button in the top right of the screen, which I've clicked in this snapshot:

This one line of code has zero effect on how the app looks when run in Froyo.